REPORT OF THE DIRECTOR I9IO 167 



costae on the sides of the brachial valve. Pedicle valve gently con- 

 vex posteriorly, deeply and broadly sinuate in front with single 

 broad, low fold in the center and two or three on the sides of the 

 valve. The cast, though excellently preserved, shows no indication 

 of a mesial septum in the brachial valve. 



Dimensions. Length, 8.5 mm ; width, 9.5 mm ; somewhat modi- 

 fied by flattening. 



Remarks. Externally this species seems closely related to 

 Camarophoria explanata McChesney, and to P. g 1 o b u- 

 1 i n a Phillips. It is very doubtful if the shell was ever so globular 

 as the latter, on the form figured by Dawson, and the former has 

 been shown by Weller to be a true Camarophoria, possessing a 

 strong mesial septum. Our specimen apparently is without this 

 septum and consequently a true Pugnax, like those of the Mountain 

 limestone of Ireland. 



Dielasma sacculus Martin 



Dielasma sacculus (Martin). Cast of ventral valve. Cape le Trou, Grindstone I. 



Beecheria davidsoni Hall & Clarke 

 A poor cast having a form very suggestive of this species. 



Edmondia intermedia nov. 



Cast small, obliquely subovate or quadrilateral, only moderately 



gibbous, beak very near the front of the shell; hinge straight with 



characteristic slit beneath it; posterior margin 



nearly straight and oblique above, rounding into the 



elliptical ventral border which passes with a still 



gentler curve upward to the hinge. Surface of 



Edmondia in- ^^^^ Striated ou its youns^cr portion with minute, 



termedia nov. j o r 



cf e°^ 1?* ?rou' evenly spaced Hues parallel with the border; there 

 Grindstone I. ^re also larger growth varices. 



Dimensions. Length, 17 mm; height, 15 mm; length of hinge, 

 about 10 mm. 



Remarks. It is not certain that this species may not be E . n i t i d a 

 Winchell, and it is also very closely related to E. q u a d r a t a 

 Weller. It differs from them, apparently, in having its beak more 

 nearly terminal. It is also closely related to E. o b 1 i q u a Hall, 



